docs: def get_innerclasses(self):
          """
          sequence of JavaInnerClassInfo instances describing the inner
          classes of this class definition
  
          reference: http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.7.6
          """  # noqa
  
          buff = self.get_attribute("InnerClasses")
          if buff is None:
              return tuple()
  
          with unpack(buff) as up:
              return tuple(up.unpack_objects(JavaInnerClassInfo, self.cpool))